Hemimycena tortuosa (P.D. Orton) Redhead -

Descripción original 
Description: Pileus 0.5 12 mm broad, hemispherical, conico-convex or convex, expanding to applanate, often slightly depressed, with involute then straight. regular or lobed-crenulate margin. which often slightly excceds the lamellac, weakly hygrophanous, slightly translucently striate when moist, purely white, changing to ivory or eream-colour to pale grey when old, opaque when dry, minutely pubescent (lens), the hairs often holding drops of water in moist conditions. Lamellae distant to fairly crowded, 1.= 12-20, 1= 1-3 (7), adnate, sometimes with small decurrent tooth or almost free, welldeveloped, reachine the margin of tLre pileus. narrow, sometimes crispy in larcer specimens. white with concolorous, entire or minutely ffocculose-denticulate edge (lens). Stipe | 27 x 0.1 | mm, cylindrical or slightly swollen at base or apex, often very short and sometimes eccentrie (when growing on the underside of bark lying on the ground) or longer and central, sometimes flexuous, white, entirely minutely pubescent (lens), the hairs often holding drops of water in moist situations, sometimes with short mycelial strands at base, white. Context very thin, white, Smell and taste indistinet. Spores (8.5) 9.0-11 x 2.5-4.5 um, Li = 2,2-3.1 (3.8), 0 = 2.6-3.0, narrowly fusiform to lacrymoid, farely subeylindrical, thin-walled, smooth, hyaline. Basidia 20-26 x 6,.0-8.0 pm, 2- and 4- (rarely 1-) spored, clavate, clamped. Basidioles 13-27 x 2.0-9.0 tum, clavate, (sub)eylindrical. Cheiloeystidia22 27(31)x 4.0 8.0 pm, lageniform, subfusiform or clavate, rarely awl-shaped, + thin-walled, rostrate, subacute to acute, rostrum usually slightly moniliform. Pleuroceystidia very rare, similar to cheilocystidia. Context of eylindrical, thin-walled, hyaline, up to 7 pm wide hyphae, Pilcipellis a cutis cheilocystidia. Context of eylindrical, thin-walled, hyaline, up to 7 pm wide hyphae, Pilcipellis a cutis ofradially arranged, eylindrical, + thin-walled, up to 8 pm wide diverticulate hyphae: diverticulae ofradially arranged, eylindrical, + thin-walled, up to 8 pm wide diverticulate hyphae: diverticulae upto 8.0(10.0)x 2.0(3.0) pim, digitate, obtuse, often irregular; terminal cells on pileus margin 10,0-25 x 4.0-7,0 um, (sub)ceylindrical, clavate or subfusoid, irregular, diverticulate to coralloid. Pileocystidia30-68 x 4.0-8.5 um, eylindrical to sublageniform, thin» to slightly thick-walled, often capitate, capitulum5.0 10,0 im wide, with often spirally twisted neck, and often diverticulate basal part. Stipitipellis a cutis of parallel, cylindrical, slightly thick-walled, up to 6 pm wide, diverticulate hyphae: diverticulac digitate, up to 10.0 x 1.0 3,0 pim, obtuse, regular or irregular, sometimes branched or coralloid, Caulocystidia 28-65 x 5.0-9.0 um. eylindrical to sublageniform, + thin-walled, with spirally twisted neck and globose, 5.0-10.0 um capitulum, sometimes with diverticulate basal part, Clamp-connections present in all issues, but irregularly distributed and usually not frequent. Chemical reactions: Neither spores nor tissues amyloid or dextrinoid, Ecology: Saprotrophic, in groups, on bark and lying decaying wood of both broadleaved and coniferous trees. sometimes on underside; always in very wet places. IUis known from Abies, A/nus, Carpintis,
Fraxinus, Salix cinerea, Taxus and Quercus,